Heat pump accessory



FIG. 1 is a perspective view of a heat pump accessory showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a side elevational view;

FIG. 5 is a side elevational view of the side opposite that shown in FIG. 4; and,

FIG. 6 is a top plan view, the opposite side being a mirror image. 

The ornamental design for a heat pump accessory, as shown and described. 